LG 22LQ630H, Service Manual

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Only for training and service purposes
TROUBLESHOOTING
1. Power-Up Boot Fail Trouble Shooting guide
2. No OSD Trouble Shooting guide
Check P401 All
Voltage Level (3.5V, 12V, 24V)
Y
N
Check Q409 output Voltage(12V)
Y
Check LVDS Cable
Y
Check LCD Module
Control board
Check power connector and
RL_ON signal OK ?
N
Replace Power Board
Check Q409 application circuit
Or replace Q409
N
Replace Cable
N
Check P401 All
Voltage Level (3.5V, 12V, 24V)
Y
N
Check IC1602 RESET and
UPDATE pin
Y
Check X1600 Clock
32.768MHz
Y
Check IC1602 IIC
Communication status
Y
Check IR input state of IC1602
57pin
Y
Re-download PTC Micom
Check power connector and
RL_ON signal OK ?
N
Replace Power Board
Check switch SW501, SW502
N
Check X1600 application circuit
or Replace X1600
Check IIC line or replace IC1602
Check IR board
N
N
N